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10a(x-y)-5b(y-x)
(x-y)的平方
人气:314 ℃ 时间:2020-03-30 06:07:08
解答
10a(x-y)-5b(y-x)
=10a(x-y)+5b(x-y)
=5(x-y)(2a+5b);
(x-y)^2
=x^2-2xy+y^2.
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